R help - Aug 2005 - background colors in image()

Hi, I am using image() function to plot a matrix which
has some missing valuies (NA). It looks like, by
default, missing values were drawn in white color, How
can I change that into a different color, say a gray
color? I tried to use bg='gray' argument with no luck.
Anyone has a suggestion?

Thanks

On Wed, 10 Aug 2005, someone needing to conceal his real name wrote:
> Hi, I am using image() function to plot a matrix which
> has some missing valuies (NA). It looks like, by
> default, missing values were drawn in white color, How
> can I change that into a different color, say a gray
> color? I tried to use bg='gray' argument with no luck.
> Anyone has a suggestion?
They are not drawn in white: in fact they are not drawn at all, so the 
current background (or if transparent, the canvas) is what you see.
> par(bg="yellow")
> image(matrix(c(1,2,NA, 1),2, 2))
works, for example.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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